Trees are the most complex and successful living plants on earth. Today they comprise more than 100,000 different species ranging from small Pigmy pine from New Zealand that are just few centimeters high to the Californian Coast Redwoods which can exceed 100m height. Trees are one of the oldest living forms of the plant life on the earth. In California the Great Basin Bristlecone Pine is over 4,800 years old and inn North Wales (UK) the Llangernyw Yew is estimated to be between 4,000 and 5,000 years old.  Throughout the world trees have adapted to the climate that surrounds them. The amount of rainfall, the ambient temperatures, the amount of daylight hours and the angle of sun influence both the behavioral patterns of trees and their natural distribution across the planet.